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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/3rdparty/adaptagrams/libvpsc/variable.h | |
parent | Initial commit. (diff) | |
download | inkscape-upstream.tar.xz inkscape-upstream.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/3rdparty/adaptagrams/libvpsc/variable.h')
-rw-r--r-- | src/3rdparty/adaptagrams/libvpsc/variable.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/3rdparty/adaptagrams/libvpsc/variable.h b/src/3rdparty/adaptagrams/libvpsc/variable.h new file mode 100644 index 0000000..aaad753 --- /dev/null +++ b/src/3rdparty/adaptagrams/libvpsc/variable.h @@ -0,0 +1,95 @@ +/* + * vim: ts=4 sw=4 et tw=0 wm=0 + * + * libvpsc - A solver for the problem of Variable Placement with + * Separation Constraints. + * + * Copyright (C) 2005-2008 Monash University + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * See the file LICENSE.LGPL distributed with the library. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Author(s): Tim Dwyer +*/ + +#ifndef VPSC_VARIABLE_H +#define VPSC_VARIABLE_H + +#include <vector> +#include <iostream> + +#include "libvpsc/block.h" +#include "libvpsc/assertions.h" + +namespace vpsc { + +class Constraint; +typedef std::vector<Constraint*> Constraints; + +/** + * @brief A variable is comprised of an ideal position, final position and + * a weight. + * + * When creating a variable you specify an ideal value, and a weight---how + * much the variable wants to be at its ideal position. After solving the + * problem you can read back the final position for the variable. +*/ +class Variable +{ + friend std::ostream& operator <<(std::ostream &os, const Variable &v); + friend class Block; + friend class Constraint; + friend class Solver; +public: + int id; // useful in log files + double desiredPosition; + double finalPosition; + double weight; // how much the variable wants to + // be at it's desired position + double scale; // translates variable to another space + double offset; + Block *block; + bool visited; + bool fixedDesiredPosition; + Constraints in; + Constraints out; + char *toString(); + inline Variable(const int id, const double desiredPos=-1.0, + const double weight=1.0, const double scale=1.0) + : id(id) + , desiredPosition(desiredPos) + , finalPosition(desiredPos) + , weight(weight) + , scale(scale) + , offset(0) + , block(nullptr) + , visited(false) + , fixedDesiredPosition(false) + { + } + double dfdv(void) const { + return 2. * weight * ( position() - desiredPosition ); + } +private: + inline double position(void) const { + return (block->ps.scale*block->posn+offset)/scale; + } + inline double unscaledPosition(void) const { + COLA_ASSERT(block->ps.scale == 1); + COLA_ASSERT(scale == 1); + return block->posn + offset; + } +}; + +//! @brief A vector of pointers to Variable objects. +typedef std::vector<Variable*> Variables; + +} +#endif // VPSC_VARIABLE_H |